linux-kernel - Re: [bisected commit 0fc9d10] NFS-server corruption with 3.4

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Message-ID: <87zk8h23wn.fsf@devron.myhome.or.jp>
Date:	Wed, 06 Jun 2012 00:07:36 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Ondrej Zary <linux@...nbow-software.org>,
	Hugh Dickins <hughd@...gle.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Hans de Bruin <jmdebruin@...net.nl>,
	Linux NFS mailing list <linux-nfs@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Toralf Förster <toralf.foerster@....de>,
	richard -rw- weinberger <richard.weinberger@...il.com>
Subject: Re: [bisected commit 0fc9d10] NFS-server corruption with 3.4

Konstantin Khlebnikov <khlebnikov@...nvz.org> writes:

> Hmm, very interesting!
> Please try this patch, it must fix the problem and print some numbers to debug.
>

I think the bug is in radix_tree_for_each_contig().

radix_tree_next_slot() returns NULL if the slot was NULL (i.e. there is
hole). But, slot == NULL is not meaning to stop iterate here. Actually,
if slot is NULL, it gets next chunk.

Bang.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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